Camber is the measured deviation of the side of a sheet from a straight edge. Camber is caused by one side of a sheet being elongated more than the other side during perforation or leveling. Camber often results from having unequal side margins on a sheet.
- Camber is measured by placing a straight edge along the concave side of the sheet and measuring the maximum distance from the straight edge to the edge of the sheet (Figure 1).
- A sheet can be sheared after it is perforated and leveled, which will make the sheet square, but the perforated pattern will still be cambered on the sheet (Figure 2).
- If sheets are cut after perforation, the camber refers only to the perforated pattern. (See sketch below F & G)
- Designers are requested to avoid different margins whenever possible.
Maximum camber all metals after perforating:
|Coils & Cut Length Ft.||Commerical Quality||Superior Quality||Special Quality|
|To 4 Ft. Inclusive||1/8"||4' = .062"|
|Over 4-6 Ft. Inclusive||3/16"||5' = .098"|
|Over 6-8 Ft. Inclusive||1/2"||6' = .140"|